Key-hole guard



(No Model.) 7

C. R. UHLMANN.

KEY HOLE GUARD. No. 396,123. Patented Jan. 15, 1889.

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UNITED STATES PATENT OFFIC V CHARLES R. UHLMANN, OF PEORIA, ILLINOIS.

KEY-HOLE GUARD.

SPECIFICATION forming part of Letters Patent No. 396,123, dated January 15, 1889.

Application filed May 2, 1888. Serial No. 272,615. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES R. UHLMANN, a resident of Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Key-Hole Guards; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates particularly to keyhole guards and lock-cases adapted to receive such guards.

I11 the accompanying drawings, Figure 1 shows a port-ion of a lock provided with my devices, the side plate being removed and the guard being in position to close the key-hole. Fig. 2 is a similar view with the guard at the Fig. 3 is a section on the line a; 00, Fig. 2. Fig. 4 shows the side of the guard opposite to that seen in Figs. 1 and 2.

In Figs. 1, 2, and at, A is an ordinary lock-case, provided with a locking-bolt, B, adapted to be actuated by a key inserted in the key-hole D.

O H are lugs formed integrally with the case, and E is a block or key-hole guard, equal in thickness to the space between the lockwalls and adapted to slide back and forth, covering the lower portion of the key-hole, as in Fig. 1, when at one limit of its path, and lying entirely without the path of the key when at its opposite limit. It is provided upon one side with a stud, E, formed integrally with it, and projecting at all times beyond the edge wall of the ease in contact with the removable side wall, K, Fig. 4, of the case. Upon the opposite side of the guard a springactuated stud, F, rests against the lug O, which is parallel to the lower side of the case.

Fig. 3 shows the reverse of the guard and attachments. The stud F slides in a recess in the guard, and is pressed outward by a spring, I. A notch, J, is adapted to fit over the lug H when in position.

To permit the sliding of the stud E, the edge wall of the case is cut away at G.

Now, when the guard is in position for obstructing the key-hole, as in Fig. 1, the end opposite to the key-hole is in contact with the lug H, which thus prevents displacement; but if the block be pressed toward the lug C by means of the stud E until its edge is within the lug it may pass to the opposite limit of its path, the stud E passing over the lug H. \Vhen released, the reaction of the lug C upon the stud F throws it into the position of Fig. 2, with the notch J over the lug H, which thus retains it in position.

By the construction shown the plate K forms a bearing upon one side for the stud by which the block or guard is actuated, and by the greater bearing-surface thus secured lateral motion of the stud is prevented. At the same time the parts, like other parts of the lock, are all released by the removal of the plate K, and may be lifted directly from the case. There is also the incidental gain in cheapness that no cores are required in casting any of the parts.

What I claim is The combination, with the lock-case A, having its edge wall notched to a suitable depth and provided with integrally-formed lugs O H, of the sliding key-hole guard E, provided with the recess .I, adapted to receive the lug H, the guard-actuating stud E, formed integrally with the guard and projecting through the notch in the edge wall of the case, the spring-actuated stud F, projecting from the guard E against the lug C, and the removable side plate, K, resting upon the guard E and stud E, retaining them in position, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' CHARLES R. UHLMANN.

\Vitnesses:

L. M. THURLOW, A. KEITHLEY. 

